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MgYPt2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two MgYPt2 ribbons oriented in the (1, 0, 0) direction. Mg is bonded in a linear geometry to two equivalent Pt atoms. Both Mg–Pt bond lengths are 2.58 Å. Y is bonded in a linear geometry to two equivalent Pt atoms. Both Y–Pt bond lengths are 2.43 Å. Pt is bonded in a linear geometry to one Mg and one Y atom.
MgY4Pt crystallizes in the cubic F-43m space group. The structure is three-dimensional. Mg is bonded to three equivalent Mg and nine Y atoms to form a mixture of face and corner-sharing MgY9Mg3 cuboctahedra. All Mg–Mg bond lengths are 3.14 Å. There are a spread of Mg–Y bond distances ranging from 3.34–3.57 Å. There are three inequivalent Y sites. In the first Y site, Y is bonded in a 3-coordinate geometry to three equivalent Mg, three equivalent Y, and three equivalent Pt atoms. All Y–Y bond lengths are 3.58 Å. All Y–Pt bond lengths are 2.88 Å. In the second Y site, Y is bonded in a bent 150 degrees geometry to two equivalent Mg, four equivalent Y, and two equivalent Pt atoms. All Y–Y bond lengths are 3.69 Å. Both Y–Pt bond lengths are 2.87 Å. In the third Y site, Y is bonded in a 4-coordinate geometry to two equivalent Mg, ten Y, and two equivalent Pt atoms. All Y–Y bond lengths are 3.62 Å. Both Y–Pt bond lengths are 3.57 Å. Pt is bonded in a 6-coordinate geometry to nine Y atoms.